Device for copying by projection images on lenticulated films



K. RANTscl-l 2,057,977 DEVICE FOR COPYING BY PROJECTION IMAGES OELENTIQULATED FILMS Oct. 20, 1936.

Filed June 21, 1934 Patented @ct.. 20, 1936 STATES PATENT orrice lDEVHJEFOR oorrruo or PROJECTION re s N LENTXCULATED FILMS laud ApplicationJune 21, M34, Serial No. 731,587 In Germany July 6, 1933 7 Claims.

My invention relates to new and useful devices for copying images onlenticulated films, which films are well lznown in the art and serve forthe taking and projecting of images in natural colors.

In my copending application 688,545 relating to Printing apparatus forlenticulated films, I have described several optical systems forprojection purposes. i'hese systems are composed lay an objective orconceive mirror and optical rhesus, especlelly plane reflectingsurfaces, which are arranged in such as. manner, that the opening of theobjective or mirror is seen in different directions from the films.Besides, from the objective, the films are seen in exactly oppositedirections. Thus I om enabled to make use of objmtlves with a. rathersmall relative aperture, though is known, that the an ular opening oicopying lenses must be about equal to that of the leriticuler elements.The reason is that the light pus-sing in the directions of the lam agesor? the objective-opening, seen in the said plahe mirrors, serve forcopying those ports of the images which correspond to the lateral zonesof the multicolor filter used in taking or projecting.

This invention is hosed on the same principle, the chief differencebeing that more than one objective is used. objective is arranged insuch a manner that it forms an image of the so purpose at least one ofthe objectives is combined with plane reflecting surfaces or otheroptical means of similar action. These have the effect that, from theopening of the corresponding objectlve, both films are seen in exactlyopposite directions.

The chief advantages of such optical system are:

The images on the copied film are of a remarkable sharpness and of highdefinition, which could not be had with the formerly used objectives ofhigh relative opening.

No moires or watering effects may be observed.

Scattered light and such light beams which are severally reflected mayeasily be completely suppressed. These light beams sometimes causeddisturbing color degradations.

The copying of those parts corresponding to different zones of themulticolor filter may be affected, for instance by the use ofdiaphragms,

wholly independently from each other. Thus I may correct wrong exposureby copying some parts with moriand other parts with less intenoriginalfilm on the some printing film. For thisslve light. Besides, individualdiaphragming of the different zones is possible for suppressing lightdifiusion from one zone into the other.

Some examples of my inventionare represented in the accompanyingdrawing, in which equal references represent equal parts. 5

Figures 1, 3, 5, 7 and 8 show the plan views of some devices accordingto the invention.

Figures 2, 4 and 6 represent the openings and images of the openings ofthe objectives, which are seen from. the films in the devices shownrespectively in the Figures 1, 3 and 5.

Referring first to Figure l, I assume the original film l to bereproduced on the duplicate film 2 by the help of the lenses 3 and Bothfilms are so arranged that they are perpendicular to the optical axis ofthe lens 3 and that this axis passes, at least approximately, by thecenter the films. The angular opening of the objective 3 is onlysufficient for taking up all these light beams which start from the filml in a direction in which the central filter zone was seen whenthe filmwas exposed in the camera. Thus this objective would only serve forreproducing on the him 2 the part of the image correspohding to saidcentral zone.

But the light beams starting from the original film in a direction whichcorresponds to one lateral zone of the taking filter are reflected bythe mirror 5 so that they pass by the objective and are then reflectedby the mirror I as to meet the film 2. The image produced by these beamsis in exact registration with that produced by the unrefiected beams.The aperture of the lens 3 is seen from the film l at 9 and from thefilm 2 at 10, where one lateral zone is seen in the taking or projectingprocess.

The mirror 6 reflects the-flight beams starting from the film in thedirection of the other lateral zone so that they pass the lens. 4 andarev then reflected by the mirror 8 as to meet the film 2. This image,too, is in exact registration with the other two. The image of theaperture of lens 4 is seen from the film l at l0 and from the film 2 at9. A diaphragm H is arranged between the lenses 3 and 4 about parallelto the optical axes so that it cuts of! all beams which may be reflectedfrom the mirror 6 and would else pass by the lens 3; l

The objective and its images, as seen Irom one film, are represented in'Figure 2. The dashdotted lines of this figure mark the edges between thezones of the multicolor filter which was employed when the view wastaken. It lsseen that the apertures 3, 9 and ID are lying symmetricallyto the centers of the corresponding 56 zones, which are marked by thesmall crosses. By increasing or decreasing the distances of the mirrorsfrom the optical axes of their corresponding lenses I may get anydesired asymmetrical position.

Further, by diaphragming the lens 4 it is possible to affect the lightbeams passing by this objective without afiecting those passing by 3.Such diaphragm are 26 and 21. They are well known in the art.

In Figure3 the original film I is imaged on the copying film 2 by thehelp of three objectives 3, l, I. The objective 3 is effective withoutany reflecting surface, the lens 4 being combined with the two mirrors 5and I, and the lens 4 being combined with the two mirrors 6 and I. Thepath of the light beams may be seen from the figure. It is similar tothat of Figure 1. The diaphragms II to it cut 01! all scattered light.

The apertures of the objectives 3, 4 and 4' which are represented inFigure 4 are seen at 9, 3 and III. They may be diaphragmed independentlyfrom each other. Such diaphragming as is effected by the diaphragms 28,29 and III, is represented in Figure 4 by the hatched areas. It may beperformed in symmetrical or in asymmetrical manner, as is afforded bythe process. Besides, the intensity of the three light beams may becontrolled independently from each other.

The arrangement 01 Figure 5 is slightly modified as compared with that01 Figure 3, one difference being that the distances of the planereflecting surfaces are somewhat greater than in the before describedFigure 3. Thus the apertures 9, 3 and III are lying asymmetrical withrespect to the centers or the corresponding filter zones. In Figure 6the images 9 and ID are a little more distant from the aperture 3 thanare the small crosses representing the centers of the correspondingfilter zones. The distances between 9 and I and between I0 and I may bediflerent or equal, according to the distances of the mirrors from theaxes of the objectives.

The lenses III and I6 placed in front of the two films and near to themserve for making the apertures to be seen from the films in distancesequal to those in which the filters are seen from the films in taking orprojecting.

The number 01' objectives may also be superior to three, for instance byarranging two further objectives over and beneath the objective 3, eachbeing combined with a pair 01. mirrors in the same manner as theobjectives 4 and 4'. Such arrangement may be useful for copying filmswith spherically formed lenticuiar elements.

Another device which is of special interest when films are reproducedonly carrying two ditterent images as is the case, for instance. withsome stereo-processes, is represented in Figure 7. The two objectives Iand l are arranged between the films I and 2 symmetrically to theconnection line or the centers of the-film gates. The plane mirrors 5and I belong to the lens 3 and the plane mirrors 6 and I to the lens Iso that the lens apertures are seen from the films at I and 4'respectively. The diaphragm Il cuts 08 all light beams which would passby the lenses directly so that only reflected beams are allowed to passby them.

The device of Figure 8 is such that duplicates at reduced or enlargedscale are had. The principle or this device is the same as that ofFigure 3. The wider film I may be that which is to be reproduced. But,01' course, the direction of the light beams may be contrary :0 that theoriginal film is the smaller one. The lenses I9, 20, II are juxtaposedbetween the films. The lens I9 forms a sharp image of the film I atreduced scale at the film l8. Its angular aperture is so chosen thatonly light corresponding to the central filter zone reaches theobjective. The analogue is valid for the lenses 20 and 2|. Images of theapertures of the objectives 20 and 2| are seen from the film I in themirrors 5 and 6 at 20 and 2i. On the other side, the mirrors 1 and 8 areadjusted so that, in these mirrors, the apertures of the objectives 20and 2| are seen from the film III at 2|!" and 2|". The exact position ofthe mirrors is defined by the condition that, from each lens, the filmsor their images formed by said mirrors are to be seen in exactlyopposite directions. For instance, from the lens 20 the film I is seenat I' and the film I8 at III. The diaphragms 22 to 25 serve for cuttingof! disturbing scattered light.

What I claim is:

1. In combination, an original film having thereon a multiplicity oflenticulations of substantially equal aperture and a group of colorrecords behind each of said lenticulations, a copy film having similarlenticulations thereon, an optical system adapted to pass light from theoriginal film to the copy film and including lenses disposed side byside transversely of the lenticulations in the path of light passingbetween said films, each lens being of smaller aperture than that of alenticulation, and optical means for directing selected components ofthe light from the records on the original film respectively throughselected ones of said lenses to the copy film.

2. In combination, an original film having thereon a multiplicity oflenticulations of substantially equal aperture and a group of colorrecords behind each of said lenticulations, a copy film having similarlenticulations thereon, an optical system adapted to pass light from theoriginal film to the copy film and including lenses disposed side byside transversely of the lenticulations in the path of light passingbetween said films, each lens being of smaller aperture than that of alenticulation, and optical means for directing selected components ofthe light from the original film respectively through selected ones ofsaid lenses to the copy film, said optical means causing the same numberof views of lenses to be seen at one of the films as there are colorrecords in one of said groups.

3. In combination, an original film having thereon a multiplicity oflenticulations of substantially equal aperture and a group of colorrecords behind each of said lenticulations, a copy film having similarlenticulations thereon, an optical system adapted to pass light from theoriginal film to the copy film, a plurality of lenses each of smalleraperture than that or a lenticulation and disposed side. by sidetransversely of the lenticulations in the path of light passing from theoriginal film to the copy film, and optical means between each film andsaid lenses causing views of each of said lenses to be seen from theentire surface of each film.

4. In combination, an original film having thereon a multiplicity oflenticulations of substantially equal aperture and a group of colorrecords behind each 01' said lenticulations formed by exposure 01 thefilm through a color filter having as many zones as there are records insaid group, a copy film having similar lenticulations thereon, anoptical system adapted to pass light from the original film to the copyfilm, a pluralact-1,977

ity of lenses each of smaller aperture than that of a lenticulation'anddisposed side by side transversely of the lenticulations in the path oflight passing from the original film to the copy film, andoptical meansbetween each film and said lenses causing views of each of said lensesto be seen from the entire surface of each film and as many views beingseen as there are zones in the filter.

5. In combination, an original film having thereon a multiplicity oflenticulations of substantially equal aperture and a group of colorrecords behind each of said lenticulations, a copy film having similarlenticulations thereon, an optical system adapted to pass light from theoriginal film to the copy film and including lenses disposed side byside transversely of the lenticulations in the path of light passingbetween said films, each lens being of smaller ap'erture than that of alenticulation, optical means for directing selected components of thelight from the records on the original film respectively throughselected ones of said lenses to the copy film, and diaphragms extendingbetween the paths taken by said components, to help define said paths.

6. In combination, an original film having thereon a multiplicity oflenticulations of substantially equal aperture and a group of colorrecords behind each of said lenticulations, a copy film having similarlenticulations thereon, an optical system adapted to pass light from theoriginal film to the copy film and including a pinrality pf lenses eachof smaller aperture than that of a lenticulation and disposed side byside transversely of the lenticulations in the path of light passingfrom the original film to thecopy film, and mirrors arranged to defiectlight passing from one of said records through one of said lenses tosaid copy film.

'I. In combination, an original film having thereon a multiplicity oflenticulations of substantially equal aperture and a group of colorrecords behind each of said lenticulations, a copy film having similarlenticulations thereon, an optical system adapted to pass light from theoriginal film to the copy film and including a plurality of lenses eachof smaller aperture than that of a lenticulation and disposed side byside transversely of the lenticulations in the path of light passingfrom the original film to the copy film, mirrors arranged to deflectlight passing from one of said records through one of said lenses tosaid copy film, and diaphragms extending between the paths of light fromthe lenses to one of the films, to help define said paths.

KURT RANTscr-r.

